misc/port.c

   1 /*
   2  * Misc. functions for systems that don't have them
   3  *
   4  * Copyright 1996 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8 #include <sys/types.h>
   9 #include <sys/time.h>
  10 #include <sys/stat.h>
  11 #include <sys/ioctl.h>
  12 #include <errno.h>
  13 #include <fcntl.h>
  14 #include <termios.h>
  15 #include <libio.h>
  16
  17 #ifndef HAVE_USLEEP
  18 #ifdef __EMX__
  19 unsigned int usleep (unsigned int useconds) { DosSleep(useconds); }
  20 #else
  21 unsigned int usleep (unsigned int useconds)
  22 {
  23     struct timeval delay;
  24
  25     delay.tv_sec = 0;
  26     delay.tv_usec = useconds;
  27
  28     select( 0, 0, 0, 0, &delay );
  29     return 0;
  30 }
  31 #endif
  32 #endif /* HAVE_USLEEP */
  33
  34 #ifndef HAVE_MEMMOVE
  35 void *memmove( void *dest, const void *src, unsigned int len )
  36 {
  37     register char *dst = dest;
  38
  39     /* Use memcpy if not overlapping */
  40     if ((dst + len <= (char *)src) || ((char *)src + len <= dst))
  41     {
  42         memcpy( dst, src, len );
  43     }
  44     /* Otherwise do it the hard way (FIXME: could do better than this) */
  45     else if (dst < src)
  46     {
  47         while (len--) *dst++ = *((char *)src)++;
  48     }
  49     else
  50     {
  51         dst += len - 1;
  52         src = (char *)src + len - 1;
  53         while (len--) *dst-- = *((char *)src)--;
  54     }
  55     return dest;
  56 }
  57 #endif  /* HAVE_MEMMOVE */
  58
  59 #ifndef HAVE_STRERROR
  60 const char *strerror( int err )
  61 {
  62     /* Let's hope we have sys_errlist then */
  63     return sys_errlist[err];
  64 }
  65 #endif  /* HAVE_STRERROR */
  66
  67 #if !defined(HAVE_CLONE) && defined(__linux__)
  68 #include <assert.h>
  69 #include <errno.h>
  70 #include <syscall.h>
  71 int clone( int (*fn)(void *), void *stack, int flags, void *arg )
  72 {
  73 #ifdef __i386__
  74     int ret;
  75     void **stack_ptr = (void **)stack;
  76     *--stack_ptr = arg;  /* Push argument on stack */
  77     *--stack_ptr = fn;   /* Push function pointer (popped into ebx) */
  78     __asm__ __volatile__( "pushl %%ebx\n\t"
  79                           "movl %2,%%ebx\n\t"
  80                           "int $0x80\n\t"
  81                           "popl %%ebx\n\t"   /* Contains fn in the child */
  82                           "testl %%eax,%%eax\n\t"
  83                           "jnz 0f\n\t"
  84                           "call *%%ebx\n\t"       /* Should never return */
  85                           "xorl %%eax,%%eax\n\t"  /* Just in case it does*/
  86                           "0:"
  87                           : "=a" (ret)
  88                           : "0" (SYS_clone), "g" (flags), "c" (stack_ptr) );
  89     assert( ret );  /* If ret is 0, we returned from the child function */
  90     if (ret > 0) return ret;
  91     errno = -ret;
  92     return -1;
  93 #else
  94     errno = EINVAL;
  95     return -1;
  96 #endif  /* __i386__ */
  97 }
  98 #endif  /* !HAVE_CLONE && __linux__ */
  99
 100
 101 /**
 102  *  It looks like the openpty that comes with glibc in RedHat 5.0
 103  *  is buggy (second call returns what looks like a dup of 0 and 1
 104  *  instead of a new pty), this is a generic replacement.
 105  */
 106 /** We will have an autoconf check for this soon... */
 107
 108 int wine_openpty(int *master, int *slave, char *name,
 109                         struct termios *term, struct winsize *winsize)
 110 {
 111     char *ptr1, *ptr2;
 112     char pts_name[512];
 113
 114     strcpy (pts_name, "/dev/ptyXY");
 115
 116     for (ptr1 = "pqrstuvwxyzPQRST"; *ptr1 != 0; ptr1++) {
 117         pts_name[8] = *ptr1;
 118         for (ptr2 = "0123456789abcdef"; *ptr2 != 0; ptr2++) {
 119             pts_name[9] = *ptr2;
 120
 121             if ((*master = open(pts_name, O_RDWR)) < 0) {
 122                 if (errno == ENOENT)
 123                     return -1;
 124                 else
 125                     continue;
 126             }
 127             pts_name[5] = 't';
 128             if ((*slave = open(pts_name, O_RDWR)) < 0) {
 129                 pts_name[5] = 'p';
 130                 continue;
 131             }
 132
 133             if (term != NULL)
 134                 tcsetattr(*slave, TCSANOW, term);
 135             if (winsize != NULL)
 136                 ioctl(*slave, TIOCSWINSZ, winsize);
 137             if (name != NULL)
 138                 strcpy(name, pts_name);
 139             return *slave;
 140         }
 141     }
 142     return -1;
 143 }
 144